Piston-head.



E. RENARD.

PISTON HE'AD.

APPLICATION FILED JUNE 3. I9I8.

' Patented Aug. 6, 1918.

W w w To all whom it mayconcem UNITED STATES PATENT OFFICE.

nnwm nnnmn'or :euitnnm, PENNSYLVARIL' PISTON-HEAD.

Specification of letters Patent.

Patented Aug. 6', 1918 Application filed lune 3.191s. Serial No. zsassa 1 Beit known that I, EDWARD RENARD, a citizen of the United States, and a resident of Burnham, county of Mifllin, State of Pennsylvania, have invented certain Improvements in Piston-Headsof whichthekfollowing is a specification.

The object of my invention is to prove the construction of p1ston heads so that they will resist the hlgh temperatures and to substitute such a head for the one,

used. c

In -.the accompanylng drawings: Figure 1 is a longitudinal sectional vlew in which leather packings were heretofore of my improved piston head; I

. -a recess 13 in the body tion forming a shoulder 3 against which fits the end of the sle'eve'4, which is mounted on the reduced portion and a nut 5 retains this sleeve in position on the rod. -The enlarged portion 6 of the sleeve has a peripheral recess 7 for the reception of one of the packing rings 8, as clearly shown in Fig.

1. Mounted on the sleeve 4 is a body portion 9 and secured to the body portion is a disk 10. In the present instance, this disk is held to the body portion 9 by screws 11, as clearly shown In Fig. 1. The disk-has a projecting hub 12, which extends into ortion. body portion is prevented rom turning on the sleeve by a pin'14, which extends into a notch 15 in the body' portion 9,

as shown. The nut 5 retains the assem bled parts of the piston in place on the rod.

' The disk 10 has a groove. 16 for one of the packing rings 8, which are split,' as shown in Fig. 4, and at the center of the body portion is a groove 17 toreceive the third pack- .ing ring 8. The body portion is reduced at each end and the faces 18 of these reduced] portions are beveled, as shown, so that when the parts are assembled two grooves are formed in which rings 19 of superheated K steam packlngs are lo ated. Each rmg 1s 4 tures of the invention.

the pack- The shown in Fig. 1. In the flanges of the disks ad oinmg the steam packing is aseries of holes 20 and in the disk of the sleeve 4 adjoining the steam packing are holes 21,.

which'are for the purpose of allowing any steam that may pass the rings at either end of the piston to enter under the superheated steam packings and' to force the rings out against the walls of the cylinder.

It will be understood that the-number of rings may be increased without departing from the essential features of the invention as, in some instances, the piston may be of greater length than that shown in the drawmgs. L Q The above described piston is especially applicable for use in air cylinders, but it will be understood that it can be used in con shaped to fit the beveled seat, as clearly I.

nection with any 'other type of cylinder without departing from the essential fea I claim O i 1. The combination in a piston, of a sleeve adapted to be mounted on a; piston rod and having an enlargement at one end; a disk reducedportion between the enlargement of the sleeve and the disk; means for holding theparts together, both the disk and the body ortion, as well as the enlargement of the s eeve having annular grooves; and packin in said grooves.

2. T e combination in a piston, of a sleeve adapted to be mounted on a piston rod, said sleeve having an enlargement at..one end, said enlargement having an annular groove therein; a-b'ody portion mounted on the sleeve and of the same diameter as the enlargement of said sleeve, said body-portion having an annular groove therein and re- .mounted on the reduced portion of .the sleeve; a-body section alsomounted on said duced portions at each end; a disk also mounted on the sleeve and secured to the bodyportion, said disk being of the same diameter as the body portion and havin' an annular groove therein; metallic pac g rings mounted in the three grooves, the reducedportions of the body formin grooves; and steam packing mounted in sai last mentioned grooves.

3. The combination of a piston rod having a reduced portion forming a shoulder; a-

sleeve mounted on the reduced portion of the rod and hav ng an enlargement at one end, and. enlargement having an annular groove therein; a body portion mounted on the sleeve; means for preventing the body portion from turning on the sleeve; a disk also mounted on the sleeve; longitudinal screws passing through the disk and into the body portion for holding the sleeve to the body portion; a'nut on one end of the piston rod for holding the assembled parts on the rod; a single groove in each of the parts; a ring in each groove, the body portion having beveled portions at each end forming, with the enlargement of the sleeve and the disk, annular grooves; and steam packing mounted in said last mentioned grooves.

4. The combination in a piston, of a sleeve the length of the piston and adapted to be mounted on a piston rod, said sleeve having a grooved enlargement at one end of the full diameter of the piston; a disk mounted on the opposite end of the sleeve and also the full diameter of the piston; a body portionmounted between the enlargement of the sleeve and the disk, each of these sections having an annular groove therein and a metallic piston ring mounted in each groove, the body portion having beveled reduced portions at each end forming, when the parts are assembled, annular grooves; and steam packing mounted in said grooves; a series of holes in the flanges of the enlargements of the sleeve and the disk which communicate with the space back of the steam packing when the parts are assembled so that any steam escaping around the end of the piston rings will enter back of the packing rings and will tend to force the rings out against the cylinder.

In witness whereof I afiix my signature.

EDWARD RENARD. 

